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There are a few builds centered around Fires of Invention that don't play very many double-costed spells so it would make sense that Jegantha might do some work there...play it as one of your two spells after your Fires turn and then use all of that mana to activate Kenrith, the Returned King or Cavalier of Flame triggers

That might sound a bit complicated, but its surprisingly pretty simple

Just five spells beforehand translates to 12 life drained and gainedscale that higher, and it becomes game-ending